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cnot2cz_decomposer

CNOT2CZDecomposer

Bases: Decomposer

Source code in opensquirrel/passes/decomposer/cnot2cz_decomposer.py 
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class CNOT2CZDecomposer(Decomposer):
    def decompose(self, gate: Gate) -> list[Gate]:
        """Predefined decomposition of CNOT gate into CZ gate with Ry rotations.

        ![image](../../../_static/cnot2cz.png#only-light)
        ![image](../../../_static/cnot2cz_dm.png#only-dark)

        Note:
            This decomposition preserves the global phase of the CNOT gate.

        Args:
            gate (Gate): CNOT gate to decompose.

        Returns:
            A sequence of gates, Ry(-π/2)-CZ-Ry(π/2), that decompose the CNOT gate.

        """
        if gate.name != "CNOT":
            return [gate]

        control_qubit, target_qubit = gate.qubit_operands
        return [
            Ry(target_qubit, -pi / 2),
            CZ(control_qubit, target_qubit),
            Ry(target_qubit, pi / 2),
        ]

decompose 

decompose(gate: Gate) -> list[Gate]

Predefined decomposition of CNOT gate into CZ gate with Ry rotations.

image image

Note

This decomposition preserves the global phase of the CNOT gate.

Parameters:

Name Type Description Default
gate Gate

CNOT gate to decompose.

 required

Returns:

Type Description
list[Gate]

A sequence of gates, Ry(-π/2)-CZ-Ry(π/2), that decompose the CNOT gate.
Source code in opensquirrel/passes/decomposer/cnot2cz_decomposer.py 
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def decompose(self, gate: Gate) -> list[Gate]:
    """Predefined decomposition of CNOT gate into CZ gate with Ry rotations.

    ![image](../../../_static/cnot2cz.png#only-light)
    ![image](../../../_static/cnot2cz_dm.png#only-dark)

    Note:
        This decomposition preserves the global phase of the CNOT gate.

    Args:
        gate (Gate): CNOT gate to decompose.

    Returns:
        A sequence of gates, Ry(-π/2)-CZ-Ry(π/2), that decompose the CNOT gate.

    """
    if gate.name != "CNOT":
        return [gate]

    control_qubit, target_qubit = gate.qubit_operands
    return [
        Ry(target_qubit, -pi / 2),
        CZ(control_qubit, target_qubit),
        Ry(target_qubit, pi / 2),
    ]